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How does VXLAN enable scalable network segmentation in modern data centers?

Asked on Nov 06, 2025

Answer

VXLAN (Virtual Extensible LAN) enables scalable network segmentation in modern data centers by using a Layer 3 overlay network to extend Layer 2 segments across a Layer 3 infrastructure. This allows for a larger number of isolated networks, beyond the traditional VLAN limit of 4096, by encapsulating Ethernet frames within UDP packets.

Example Concept: VXLAN uses a 24-bit segment identifier, known as the VXLAN Network Identifier (VNI), which allows for up to 16 million unique network segments. This is achieved by encapsulating Layer 2 Ethernet frames in Layer 3 UDP packets, enabling Layer 2 adjacency over a Layer 3 network. VXLAN is commonly implemented in data centers to provide scalable and flexible network segmentation, supporting multi-tenancy and workload mobility across distributed environments.

Additional Comment:

VXLAN is often used in conjunction with technologies like EVPN for control plane signaling.
It supports integration with existing network infrastructure without requiring changes to the underlying physical network.
VXLAN can enhance network security by isolating tenant networks and reducing broadcast domain size.
It is supported by major network vendors, including Cisco, Juniper, and Arista, and is compatible with cloud environments.

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Ask any question about Networking here... and get an instant response.

How does VXLAN enable scalable network segmentation in modern data centers?

Asked on Nov 06, 2025

Answer

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